Davina McCall has been tested for hypothermia after completing a one-mile swim in open water, despite terrible weather conditions.

The 46-year-old took to Lake Windemere as part of her 500-mile Beyond Breaking Point challenge, which will see her run, swim and cycle from Edinburgh to London by Friday to raise money for Sport Relief.

With the weather misbehaving across the UK, Davina’s gruelling challenge has seen her cycling through temperatures of just 3°C, with winds of up to 40mph.

Following the latest stretch of the triathlon, Sport Relief chiefs confirmed that Davina was ‘undergoing a medical assessment after suffering suspected signs of hypothermia’.

Professor Greg Whyte, the trainer for the Sport Relief challenges, said: ‘These are the worst weather conditions we’ve seen on any challenge – it’s the worst weather ever.’

Davina can be seen in a newly released video having to be dragged out of the water at the end of her swim after the cold and fatigue apparently overwhelm her.

Davina had admitted that she was petrified of the swim (Picture: PA)

Tweets sent out by the Sport Relief team during Davina’s swim revealed: ‘She’s struggling. Finding it incredibly hard to breathe because of the intense cold #davina #windermere.

‘Unfortunately this swim is proving to be every bit as difficult as #davina feared.

Davina had been petrified of this particular leg of the challenge, writing in The Telegraph last week: ‘I don’t like swimming in lakes and I especially don’t like swimming in lakes that are only a degree or two above freezing.

‘My open water training under the tutelage of Prof Greg Whyte who helped David Walliams and John Bishop hit extraordinary heights has been incredibly tough and the cold is indescribable – God only knows what Windermere will be like.’